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2. Wireless telegraphy - Wikipedia

   en.wikipedia.org/wiki/Wireless_telegraphy

   Wireless telegraphy or radiotelegraphy, commonly called CW ( continuous wave ), ICW (interrupted continuous wave) transmission, or on-off keying, and designated by the International Telecommunication Union as emission type A1A or A2A, is a radio communication method. It was transmitted by several different modulation methods during its history.

3. Cable television - Wikipedia

   en.wikipedia.org/wiki/Cable_television

   Cable television is a system of delivering television programming to consumers via radio frequency (RF) signals transmitted through coaxial cables, or in more recent systems, light pulses through fibre-optic cables. This contrasts with broadcast television, in which the television signal is transmitted over-the-air by radio waves and received ...

4. Television transmitter - Wikipedia

   en.wikipedia.org/wiki/Television_transmitter

   A television transmitter is a transmitter that is used for terrestrial (over-the-air) television broadcasting. It is an electronic device that radiates radio waves that carry a video signal representing moving images, along with a synchronized audio channel, which is received by television receivers ('televisions' or 'TVs') belonging to a ...

5. Multichannel multipoint distribution service - Wikipedia

   en.wikipedia.org/wiki/Multichannel_Multipoint...

   MMDS microwave dish. Multichannel multipoint distribution service ( MMDS ), formerly known as broadband radio service ( BRS) and also known as wireless cable, is a wireless telecommunications technology, used for general-purpose broadband networking or, more commonly, as an alternative method of cable television programming reception.

6. Transmitter - Wikipedia

   en.wikipedia.org/wiki/Transmitter

   Commercial FM broadcasting transmitter at radio station WDET-FM, Wayne State University, Detroit, US.It broadcasts at 101.9 MHz with a radiated power of 48 kW.. In electronics and telecommunications, a radio transmitter or just transmitter (often abbreviated as XMTR or TX in technical documents) is an electronic device which produces radio waves with an antenna with the purpose of signal ...

7. Orthogonal frequency-division multiplexing - Wikipedia

   en.wikipedia.org/wiki/Orthogonal_frequency...

   Conceptually, OFDM is a specialized frequency-division multiplexing (FDM) method, with the additional constraint that all subcarrier signals within a communication channel are orthogonal to one another. In OFDM, the subcarrier frequencies are chosen so that the subcarriers are orthogonal to each other, meaning that crosstalk between the sub ...